CODEWITHSUNDEEP
smalltalkpharo
dnobl
dnobl

Reputation: 147

Methods in Pharo

I am still learning Pharo, but it is a bit confusing. There two classes, CarRental and Car, and a Test class, CarRentalTest.

There are fixed number of cars, the same car cannot be rented twice, I have the code, but there is a mistake.

| carRental redPanda yellowPanda blackTesla |
    carRental := CarRental new.
    redPanda := Car panda.
    yellowPanda := Car panda.
    blackTesla := Car tesla.
    carRental
        addCar: redPanda;
        addCar: yellowPanda;
        addCar: blackTesla.
    self assert: carRental availableCars size equals: 3.
    carRental rent: redPanda days: 5.
    self assert: carRental availableCars size equals: 2.
    self assert: carRental rentedCars size equals: 1

I tried to initialize the availableCars and rentedCard methods, but there is still an issue.

Upvotes: 3

Views: 424

Answers (1)

Leandro Caniglia
Leandro Caniglia

Reputation: 14858

You need to keep track of rented cars, right? To do that add the ivar rented to the CarRental class and initialize it to an empty collection:

rented := OrderedCollection new.

(in other words, include the line above in the #initialize method - instance side.)

Now, every time you rent a car add it to the rented collection:

rent: aCar
  rented add: aCar

and when the car is returned

return: aCar
  rented remove: aCar

Also you can add the getter method which was missing so far

rentedCars
  ^rented

and compute the cars available for rent as

availableCars
  ^cars copyWithoutAll: rented

Upvotes: 4

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